diff options
Diffstat (limited to 'sandbox/sebastien/java/embed/modules/common-java/src/main/java/org/apache/tuscany/sca/common/java/classloader/ClassLoaderDelegate.java')
-rw-r--r-- | sandbox/sebastien/java/embed/modules/common-java/src/main/java/org/apache/tuscany/sca/common/java/classloader/ClassLoaderDelegate.java | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/sandbox/sebastien/java/embed/modules/common-java/src/main/java/org/apache/tuscany/sca/common/java/classloader/ClassLoaderDelegate.java b/sandbox/sebastien/java/embed/modules/common-java/src/main/java/org/apache/tuscany/sca/common/java/classloader/ClassLoaderDelegate.java new file mode 100644 index 0000000000..522880711c --- /dev/null +++ b/sandbox/sebastien/java/embed/modules/common-java/src/main/java/org/apache/tuscany/sca/common/java/classloader/ClassLoaderDelegate.java @@ -0,0 +1,102 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, + * software distributed under the License is distributed on an + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY + * KIND, either express or implied. See the License for the + * specific language governing permissions and limitations + * under the License. + */ + +package org.apache.tuscany.sca.common.java.classloader; + +import java.io.IOException; +import java.net.URL; +import java.util.ArrayList; +import java.util.Collection; +import java.util.Enumeration; +import java.util.List; + +import org.apache.tuscany.sca.common.java.collection.CompoundEnumeration; + +/** + * + * @tuscany.spi.extension.asclient + * + */ +public class ClassLoaderDelegate extends ClassLoader { + private final List<ClassLoader> classLoaders = new ArrayList<ClassLoader>(); + + /** + * @param parent The parent classloaders + * @param loaders A list of classloaders to be used to load classes or resources + */ + public ClassLoaderDelegate(ClassLoader parent, ClassLoader... loaders) { + super(parent); + if (loaders != null) { + for (ClassLoader cl : loaders) { + if (cl != null && cl != parent && !classLoaders.contains(cl)) { + this.classLoaders.add(cl); + } + } + } + } + + /** + * @param parent The parent classloaders + * @param loaders A list of classloaders to be used to load classes or resources + */ + public ClassLoaderDelegate(ClassLoader parent, Collection<ClassLoader> loaders) { + super(parent); + if (loaders != null) { + for (ClassLoader cl : loaders) { + if (cl != null && cl != parent && !classLoaders.contains(cl)) { + this.classLoaders.add(cl); + } + } + } + } + + @Override + protected Class<?> findClass(String className) throws ClassNotFoundException { + for (ClassLoader parent : classLoaders) { + try { + return parent.loadClass(className); + } catch (ClassNotFoundException e) { + continue; + } + } + throw new ClassNotFoundException(className); + } + + @Override + protected URL findResource(String resName) { + for (ClassLoader parent : classLoaders) { + URL url = parent.getResource(resName); + if (url != null) { + return url; + } + } + return null; + } + + @SuppressWarnings("unchecked") + @Override + protected Enumeration<URL> findResources(String resName) throws IOException { + Enumeration<URL>[] enums = new Enumeration[classLoaders.size()]; + int index = 0; + for (ClassLoader parent : classLoaders) { + enums[index++] = parent.getResources(resName); + } + return new CompoundEnumeration<URL>(enums); + } +} |